Summary: For each of the three questions I chose a particular number/formula (axb)and slowly began to refine these numbers we selected so it becomes more and more relevant to the question whilst attempting to discern any patterns that emereged from my working out. Although this worked for most of the problems, for some a little more thought was required to solve it.
For Question 1, after realizing that a square is merely a type of rectangle we concluded that the answer was 10 by 10 (10x10) which equaled 100.
Question 2 begged a slightly different approach due to the fact that we only had 3 fencing areas to deal with. I found the answer to be 20+10+10 which equals 40 fencing sections and the area would be 20 x 10 = 200.
Finally for Question 3 I used pure trial and error. However I did realize a sort of "middle ground" was necessary and that the longer side of the wall and the top segement of the wall could not have a very drastic difference in their measurements. I also used letters (a,b,c e.t.c) for this question to simplify the working out.
Watch the link below for my full explanation and method for each question:
http://www.educreations.com/lesson/view/maths-enrichment/4765882/?s=g42…